Features1Bicycle Lithium Modification Controller Kit; Contains 17A controller, M5 panel, thumb throttle and booster. Suitable for DIY modification to meet all needs. 2Controller Housing: Made of metal with a fluted design, it protects the internal circuit due to its good heat dissipation function, thus avoiding thermal overload. 3ABS Material Panel: Light, strong and durable, fine workmanship, with nice toughness and waterproof performance, to provide better protection for the internal circuit, making it more durable. 4Panel Has Multiple Functions; When riding a bike, the product will display many useful data on your bike, such as switch buttons, light switch, battery level display and other functions, a display can keep you abreast of the situation. 517A Controller Kit: Panel mounting diameter is 22.2mm. Suitable for 250W350W motor; Mainly used for DIY electric bicycles, electric scooters, folding bikes and so on. Easy to maintain, improves riding enjoyment and is suitable for cyclists who like a challenge.SpecificationItem Type:ElectricBikeMotorControllerKitWeight: 635g/22.4ozMaterial: ABS, rubber, aluminum alloy, metalApplication: Suitable for 250W-350W motorController Size: 95 x 50 x 30mm/3.74 x 1.97 x 1.18inController Current: 17AController Speed Setting: 1.1-4.2VBrake: Input low levelPackage List1 x Panel1 x Controller1 x Thumb Throttle1x PowerAssist Cable1x PowerAssistMagneticSheet2 x Instructions